CN1291332A - Video and audio data recording device, video and audio data playback device, video and audio data recording and playback device, video and audio data recording method, video and audio data playback method, and medium - Google Patents

Abstract

The video/audio data recording/reproducing apparatus of the present invention has an interface circuit for receiving a control command for generating an AV file and a hard disk control circuit, and can perform repeated recording based on the AV file. In the repeated recording operation, the frame number of the first frame of the AV file is stored as an offset value in the AV file area management table, and the positions of the respective frames are managed in accordance with the frame number after the start of repeated recording.

Description

Video and audio data recording device, video and audio data playback device, video and audio data recording and playback device, video and audio data recording method, video and audio data playback method, and medium

technical field

The present invention relates to a recording and playback device or a recording and playback method using a magnetic disk, and in particular to a video and audio data recording device, a video and audio data playback device, and a video and audio data recording and playback device for recording or reproducing real-time data such as AV (AudioVisual: audiovisual) data. Device, audiovisual data recording method, audiovisual data playback method, and medium.

Background technique

In recent years, the recording capacity and transmission rate of HDD (Hard Disk Drive) have increased rapidly, and it has been possible to record and replay moving image data, and an image and sound data recording and playback device using HDD has been developed.

Fig. 19 is a block diagram showing a conventional audiovisual data recording and reproducing device. In the figure, 190 is a video and audio data recording and playback device, and 191 is a control circuit. The control circuit 191 is used to input and output video and audio data (hereinafter referred to as AV data) to the outside of the video and audio data recording and playback device 190, and at the same time make the video and audio Each part of the data recording and playback device 190 operates. 192 is the drive circuit of the drive mechanism, 193 is the buffer RAM, 194 is the read/write signal processing circuit, and 198 is the HDA (Head Disk Assembly) that forms the hard disk 195, the magnetic head 196 and the drive mechanism 197 into one.

The basic operation of the audiovisual data recording and reproducing device constructed in this way is as follows. It temporarily stores the input AV data in the buffer RAM 193 through the control circuit 191, and simultaneously transmits the AV data to the HDA 198, so that the AV data is recorded in the hard disk 195.

In addition, the read/write signal processing circuit 194 detects the position of the magnetic head 196 on the hard disk 195 and then transmits it to the control circuit 191 . The control circuit 191 refers to the position signal. The driving signal of the driving mechanism is generated and output to the driving circuit 192 of the driving mechanism, and then the driving circuit 192 of the driving mechanism outputs the driving signal to the driving mechanism 197 in the HDA198. Using this drive signal, the magnetic head 196 can be positioned at a desired position on the hard disk 195 , and AV data can be recorded and reproduced in accordance with a read/write control signal output from the control circuit 191 .

In a recording and reproducing device using a hard disk such as the above-mentioned audiovisual data recording and reproducing device 190, the high-speed access performance of the hard disk is repeatedly used to realize the recording function (for example, Japanese Patent Application Laid-Open No. 9-139009). The so-called repeated recording function is a function of repeatedly rewriting images of a certain time unit in a predetermined area on the hard disk, so that the user can view images of a certain time before the current time. For example, when you want to record a video, even if you press the video recording instruction button, the actual recorded screen is about 5 to 10 seconds late. Therefore, it is usually more convenient to record the image slightly earlier than the image to be displayed on the screen, for example, about 10 seconds earlier, as described above.

Such a repeat recording function is realized by the control circuit 191 appropriately controlling the read/write signal processing circuit 194 and the drive circuit 192 of the drive mechanism in the above-mentioned audiovisual data recording and playback device 190 .

In addition, a serial bus based on the IEEE (Institute of Electrical and Electronics Engineers Institute of Electrical and Electronics Engineers) 1394 standard is widely used as a standard interface for connecting general digital AV equipment.

Fig. 20 is a diagram showing the configuration of various AV equipment and related equipment connected via the IEEE1394 bus. In the figure, 190 is an audiovisual data recording and reproducing device. 200 is a controller, for example realized by a computer. 201 is a digital monitor for displaying AV data of digital data as images, 202 is a VTR for recording and reproducing AV data, and 203 is a tuner for selecting a transmitting station of an AV data source and outputting AV data A device 204 is an IEEE1394 serial bus for connecting with the aforementioned various devices and exchanging various signals such as AV data and control commands.

As shown in FIG. 20, each device can exchange control information such as digital AV data and commands for controlling connected devices via the 1394 serial bus. For example, if a personal computer is used as the controller 200 to issue control commands, a single personal computer can control all AV equipment connected to the 1394 serial bus.

As an AV device control command set used on the 1394 serial bus, there is, for example, an AV/C (Audio Video/Control) command set. The controller 200 can control the audiovisual data recording and reproducing device 190 using such AV equipment control commands.

In the conventional AV equipment control command set represented by the AV/C command set, as commands to control the recording and playback operations of the audiovisual data recording and playback device, there are playback commands for playback or operation, and recording operations. In addition to the recording command and the stop command for stopping the recording operation, there are also search commands for moving the recording and playback position on the hard disk.

In order to realize the repeat recording operation described above in the audiovisual data recording and reproducing apparatus connected by the IEEE1394 serial bus interface, several AV equipment control commands must be used in conjunction.

FIG. 21 shows the sequence of commands when performing repetitive recording to a predetermined area on the hard disk in order to realize the repetitive recording operation using the above-mentioned conventional AV equipment control command set. Next, referring to this figure, a description will be given of the procedure for realizing the repetitive recording operation using conventional AV equipment control commands.

The controller 200 starts to issue a search command 213 to the audiovisual data recording and playback device 190 . Once the audiovisual data recording and playback device 190 receives the search command 213, it moves the AV data recording location to a predetermined location on the built-in hard disk, and completes the setting work for AV data recording preparation.

Next, the controller 200 issues a recording command 214 . Upon receiving the recording command 214, the audiovisual data recording and reproducing device 190 starts recording AV data from the aforementioned predetermined position.

During recording of the AV data, the controller 200 issues a search command 213 once the location specified by the final position of the specified area is confirmed. Once the audiovisual data recording and playback device 190 receives the reissued search command 213, it stops the recording operation, then returns to the initial position of the specified recording area determined by the initial search command, and starts the recording operation again. Next, the controller 200 issues a search command 213 every time the predetermined final area is confirmed, and performs recording using repeated overwriting.

In addition, the controller 200 issues a stop command 215 when stopping the recording operation of the audiovisual data recording and playback device 190 . Upon receiving the stop command 215, the audiovisual data recording and playback device 190 stops the recording operation.

The process of controlling the AV equipment connected to the IEEE1394 serial bus by using the control commands in the conventional technology to realize the repeat recording function is as described above. But in this action, the controller 200 always checks the area position of the repeated recording object multiple times and sends a search command 213 corresponding to the check, which adds a heavy burden to the controller 200 .

In addition, on the audiovisual data recording and reproducing device 190 side, there is a time lag between receiving the search command 213 and confirming the command and then moving the recording position, so the AV data that should be recorded may be lost.

Therefore, it cannot be said that the function of repeatedly rewriting AV data in a certain area, such as the repeat recording function, can be fully realized by using the above-mentioned conventional control command set.

Furthermore, when a recording and playback area of a predetermined size is set for a specific purpose like repeated recording, it is necessary to secure a recording area of the above-mentioned predetermined size on the hard disk in advance so as not to use it for other purposes. In the audiovisual data recording and reproducing apparatus using the prior art, such a specific area is directly managed on the system side in advance, which is different from the recording area that can be freely used by the user through the controller such as AV/C commands. In other words, the control command for securing the above-mentioned area does not exist in the conventional AV equipment control command set.

That is to say, when using the video and audio data recording and playback device of the prior art connected to the IEEE1394 serial interface, there is a problem that the user cannot control the repeat recording function or the function of flexibly setting the recording area according to the purpose through the controller.

Summary of the invention

The present invention is made in view of the above-mentioned problems of the conventional audiovisual data recording and reproducing apparatus.

The first invention of the present invention (corresponding to claim 1) is an image and audio data recording device, characterized in that it has a recording medium for recording image and/or audio data, and records the image and/or audio in the recording area of the aforementioned recording medium. Recording area recording means for data recording, command receiving means for receiving control commands from devices connected through the bus, and AV file management means, when the AV file management means receives an order to generate an AV file by using the command receiving means, An AV file management table including correspondence information between the recording area of the recording medium and the AV file is set to generate an AV file of a predetermined size. The table records image and/or audio data in the recording area.

In addition, a second invention of the present invention (corresponding to claim 2) is the audiovisual recording device according to the first invention, wherein the recording area recording means corresponds to the AV file based on the AV file management table. In the recording area, image and/or sound data are recorded by repeated overwriting.

In addition, a third invention of the present invention (corresponding to claim 4) is a video and audio data recording device, characterized in that it has a recording medium for recording video and/or audio data, and performs video recording on a recording area in the recording medium. And/or recording area recording means for audio data recording, command receiving means for receiving control commands from devices connected via the bus, and maximum AV file size setting means, when the specified maximum AV file size is received by the command receiving means In the case of a maximum AV file size setting command, the maximum AV file size setting means sets the maximum file size in the AV file management table, and in the audiovisual data recording device, the recording area recording means The AV file management table is used to record video and/or audio data in the recording area.

In addition, a fourth invention of the present invention (corresponding to claim 5) is the audiovisual data recording device according to the third invention, wherein the recording area recording means, based on the largest AV file size in the AV file management table, The recording area corresponding to the AV file is repeatedly overwritten to record image and/or sound data.

In addition, the fifth invention of the present invention (corresponding to claim 7) is an image and audio data reproducing device, characterized in that it has a recording medium for recording image and/or audio data, and the recording area including the recording medium and the AV An AV file management means for managing correspondence information between files in an AV file management table, a command receiving means for receiving a control command from a device connected via a bus, and any one of the first to fourth inventions after receiving the control command In the reproducing means for reproducing the image and/or audio data recorded by the audiovisual data recording device according to the invention, in the audiovisual data reproducing device, the command receiving means receives and executes the AV file data as A playback command for a playback operation of an object, and upon receiving the playback command, the playback means plays back image and/or audio data from the recording area based on the AV file management table.

In addition, the sixth invention of the present invention (corresponding to claim 11) is an audiovisual data recording and reproducing apparatus characterized in that the audiovisual data recording apparatus described in any one of the first to fourth inventions is combined with the audiovisual data recording apparatus of the fifth invention. Said video and audio data playback device is combined.

In addition, the seventh invention of the present invention (corresponding to claim 12) is a video and audio data recording method, characterized in that a recording medium for recording video and/or audio data is used, and video recording is performed on a recording area in the recording medium. And/or recording area recording means for audio data recording, command receiving means for receiving control commands from devices connected via the bus, and AV file management means for generating AV files after receiving and generating AV files using the command receiving means When an instruction is given, an AV file management table including the correspondence information between the recording area of the recording medium and the AV file is set, and an AV file of a predetermined size is generated. The area recording means is a step of recording image and/or audio data in the recording area according to the AV file management table.

In addition, the eighth invention of the present invention (corresponding to claim 13) is a video and audio data reproducing method, characterized in that a recording medium for recording video and/or audio data is used, and a recording area including the recording medium and The AV file management means for managing the AV file management table of the correspondence information between AV files, the command receiving means for receiving a control command from a device connected via a bus, and the image described in the seventh invention will be used after receiving the control command. A reproducing means for reproducing image and/or audio data recorded by the audio data recording method, in which the image and audio data reproducing method includes receiving and reproducing the data of the AV file by the command receiving means The step of reproducing the command further includes the step of reproducing image and/or audio data from the recording area according to the AV file management table upon receiving the playback command by the playback means.

In addition, the ninth invention of the present invention (corresponding to claim 14) is a program recording medium, characterized in that each means of the audiovisual data recording device described in any one of the first to fourth inventions is recorded by a computer or A program for all or some of the functions of each part.

In addition, a tenth invention of the present invention (corresponding to claim 15) is a program recording medium, characterized in that a program for executing all or part of the steps of the operation of the method for recording audiovisual data according to the seventh invention is recorded by a computer. .

The audiovisual data recording and reproducing device of the present invention provides a predetermined area which can be arbitrarily set by the user in the recording area, controls the recording operation, and continuously performs overwrite recording such as pre-recording.

In addition, the tenth invention of the present invention (corresponding to claim 18) is an audiovisual data recording and reproducing device characterized in that it has recording means for recording input AV data blocks as an AV file,

A playback means for playing back AV data blocks recorded in an AV file,

AV file specifying means for specifying an AV file,

Recording and playback position specifying means for specifying a recording and playback position in an AV file,

As well as location information management means and recording and playback position setting means,

The position information management means, when recording successively input AV data blocks in an AV file, adds absolute position information corresponding to each AV block that does not change the position information as the recording progresses, and stores and manages it as position information.

The recording and playback position setting means searches for the position information managed by the position information management means in the AV file specified by the AV file specifying means when the recording and playback position is specified by the recording and playback position specifying means. An AV data block consistent with the designated position, and setting the recording and playback position in the data block,

The recording means or the reproducing means records or reproduces from the recording and reproducing position set by the recording and reproducing position setting means in the designated AV file as a starting point.

In addition, the eleventh invention of the present invention (corresponding to claim 22) is an audiovisual data recording and reproducing apparatus characterized by comprising recording means for recording input AV data blocks as an AV file,

Playback means for playing back AV data blocks recorded in an AV file,

AV file specifying means for specifying an AV file,

Recording and playback position specifying means for specifying a recording and playback position in an AV file,

As well as location information management means and recording and playback position setting means,

The position information management means has a 2nd and a 2nd position information management method, and the two methods can be switched according to the recording and playback operation mode. The first position information management method is to record sequentially input AV data blocks on the AV When in the file, absolute position information that does not change the content as the recording proceeds is added to each AV data block, and it is stored and managed as position information. The second position information management method is to use the specified position of the AV file as The relative position information of the starting point is managed as the position information of each AV data block,

The recording and playback position setting means is to search for the corresponding location information according to the corresponding additional position information of the position information management means in the AV file specified by the AV file designation means when utilizing the recording and playback position designation means to designate the recording and playback position. The AV data block with the same designated position, and set the recording and playback position in the data block,

The recording means or the reproducing means records or reproduces from the recording and reproducing position set by the recording and reproducing position setting means in the designated AV file as a starting point.

Brief description of the drawings

FIG. 1 is a diagram showing the structure of the audiovisual data recording and playback device of the present invention.

Fig. 2 shows the situation when the audiovisual data recording and playback device of the present invention constitutes other devices and systems.

FIG. 3 shows the sequence of control commands sent from the controller 20 to the audiovisual data recording and reproducing apparatus 10 during the pre-recording operation in the audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 4 shows the relationship between the hard disk 16 and the AV file when the pre-recording operation is performed in the audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 5 shows the arrangement of AV data in two states of pre-recording or overwriting recording and normal recording or additional recording on the hard disk 16 in the audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention.

6 shows the sequence of various commands issued from the controller 20 to the audiovisual data recording and reproducing apparatus 10 when reproducing AV data based on the management table in the audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 7 shows the sequence of control commands sent from the controller 20 to the audiovisual data recording and reproducing apparatus 10 during the prerecording operation in the audiovisual data recording and reproducing apparatus according to Embodiment 2 of the present invention.

Fig. 8 shows the relationship between the hard disk 16 and the AV file when the pre-recording operation is performed in the audiovisual data recording and reproducing apparatus according to Embodiment 2 of the present invention.

9 (a) to (f) are diagrams showing the format of each control command received and executed by the audiovisual data recording and playback device 10 according to Embodiment 1 of the present invention.

10 (a) to (c) are diagrams showing the format of each control command received and executed by the audiovisual data recording and playback device 10 according to Embodiment 2 of the present invention.

Fig. 11 is a diagram showing the structure of an AV file area management table in Embodiment 3 of the present invention.

Fig. 12 is a diagram showing the relationship between the data arrangement on the hard disk and the data arrangement on the AV file during the repeated recording operation in Embodiment 3 of the present invention.

Fig. 13 is a diagram showing the format of each control command received and executed by the audiovisual data recording and playback device according to Embodiment 3 of the present invention.

Fig. 14 shows the sequence of control commands sent from the controller 2020 to the audiovisual data recording and reproducing apparatus 10 when the recording operation and the reproducing operation are repeated simultaneously in Embodiment 3 of the present invention.

Fig. 15 shows the change with time of the record data structure and position information in the AV file when the repeat recording operation is performed in Embodiment 3 of the present invention.

Fig. 16 shows the correspondence between the record data structure and position information in the AV file when the repeated recording operation is performed and after the repeated recording operation and playback operation are stopped in Embodiment 4 of the present invention.

Fig. 17 shows the correspondence between the record data structure and position information in the AV file when the repeated recording operation is interrupted and restarted in Embodiment 5 of the present invention.

Fig. 18 is a diagram showing the structure of an AV file area management table according to Embodiment 5 of the present invention.

Fig. 19 is a block diagram of a conventional audiovisual data recording and reproducing device.

FIG. 20 shows the situation when other devices and systems are constructed using the conventional audiovisual data recording and reproducing device.

FIG. 21 shows the sequence of control commands sent from the controller to the audiovisual data recording and reproducing apparatus 100 in the pre-recording operation in the conventional audiovisual data recording and reproducing apparatus 100 .

Fig. 22 is a graph showing changes in the structure of recorded data in an AV file and changes in position information over time when relative position information is used for management during repeated recording operations.

The best form for carrying out the invention

This embodiment will be described below.

Embodiment 1

Fig. 1 is a diagram showing the configuration of an audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention. In the figure, 10 is an audiovisual data recording and playback device.

In addition, in the video and audio data recording and playback device 10, 11 is an interface circuit that receives control commands input from the outside of the video and audio data recording and playback device 10, and simultaneously performs input and output of video and audio data (hereinafter referred to as AV data), and 12 is an interface circuit that receives input and output from the video and audio data recording and playback device 10. The interface circuit 11 controls the HDD control circuit to operate each part of the audiovisual data recording and playback device 10, 13 is a drive circuit for the drive mechanism, 14 is a buffer RAM, and 15 is a read/write signal processing circuit. 19 is an HDA in which a hard disk 16, a magnetic head 17, and a drive mechanism 18 are integrally formed.

In addition, except for the configuration of the interface circuit 11 and the HDD control circuit 12, the configuration and operation of other parts are the same as those of the conventional audiovisual data recording and reproducing device 190.

In addition, Fig. 2 shows the situation when the audiovisual data recording and reproducing apparatus according to Embodiment 1 of the present invention constitutes other digital devices and systems. In the figure, 20 is a controller for controlling the audiovisual data recording and playback device 10 and other connected devices, 21 is a digital monitor for outputting digital data, that is, AV data as images, and 22 is a VTR for recording and reproducing AV data. 23 is a tuner for receiving digital broadcast data which is an AV data source, and 24 is a bus for connecting to each of the above-mentioned devices and exchanging various signals such as AV data and control commands. Here, an IEEE1394 bus is used as an example.

9(a) to (g) are diagrams showing the format of each control command received and executed by the audiovisual data recording and playback device 10 according to Embodiment 1 of the present invention. Next, each control command and the operation executed by each control command will be described with reference to this figure.

First, FIG. 9(a) shows an AV file generation command 90, which has an AV file specifying parameter as parameter 1 and an AV file size specifying parameter as parameter 2. The AV file specifying parameter is set as substitute data when it is sent from the controller 20 to the audiovisual data recording and reproducing apparatus 10, and when a response is received, the assigned AV file specifying parameter is sent from the audiovisual data recording and reproducing apparatus 10. The generated AV file is accessed according to the specified parameters of the AV file.

When receiving the AV file creation command, the HDD control circuit 12 creates an AV file of a size specified by parameter 2, and stores the information of the AV file.

Next, FIG. 9( b ) shows a recording operation setting command 91 . The recording operation setting command selects the recording operation when the rewriting of the entire AV file is completed. The recording operation setting command 91 has an AV file specification parameter as parameter 1 and a recording operation mode as parameter 2 . The recording operation method of the parameter 2 is further divided into a rewriting method and an abort method.

Upon receiving the recording operation setting command, the HDD control circuit 12 stores the recording operation mode set in parameter 2 for the specified AV file.

FIG. 9(c) shows an additional recording command 92. As shown in FIG. The additional recording command 92 has an AV file specifying parameter as parameter 1 .

Upon receiving the additional recording command 92, the HDD control circuit 12 starts recording new data to the designated AV file. The size of an AV file increases as data is continuously recorded.

FIG. 9(d) shows an AV file overwrite record command 93. As shown in FIG. The AV file overwrite recording command 93 has an AV file specifying parameter as parameter 1 .

When the HDD control circuit 12 receives the AV file rewrite recording command 93, it starts to rewrite and record the specified AV file, and continuously rewrites the data in the AV file in sequence. When the HDD control circuit 12 completes rewriting of all AV files, it selects an operation according to the set recording operation method. When the rewrite method is specified, the old data before the recording time is sequentially rewritten, and when the stop method is specified, the recording operation is stopped.

FIG. 9( e ) shows the playback operation setting command 94 . The playback operation setting command 94 sets the playback operation method when instructing playback of an area that has not been overwritten in the generated AV file. The replay operation method is divided into a substitute data replay method and a stop method. The playback operation setting command has an AV file designation parameter as parameter 1 and a playback operation mode as parameter 2 . Upon receiving the playback operation setting command 94, the HDD control circuit 12 records the playback operation mode set by the parameter 2.

The playback command 95 is shown in FIG. 9(f). The playback command 95 has an AV file specifying parameter as parameter 1 .

When receiving the playback command 95, the HDD control circuit 12 controls playback of the designated AV file.

Finally, a stop command 96 is shown in FIG. 9(g). The stop command has no arguments (reserved). Upon receiving the stop command 96, the HDD control circuit 12 ends the recording operation and playback operation.

Next, the operation of the audiovisual data recording and reproducing apparatus 10 having the above-mentioned structure in Embodiment 1 of the present invention will be described.

First, the pre-recording operation of the audiovisual data recording and reproducing apparatus 10 will be described with reference to FIGS. 3 to 5 . FIG. 3 shows the sequence of control commands sent from the controller 20 to the audiovisual data recording and reproducing device 10 during the pre-recording operation. FIG. 4 shows the relationship between the hard disk 16 and the AV file when the prerecording operation is performed in the first embodiment. FIG. 5 shows the arrangement of AV data in two states on the hard disk 16: pre-recording, that is, an overwrite recording state, and an additional recording state corresponding to normal recording.

In addition, the relationship between the data layout on the hard disk 16 shown in FIG. 4 and the AV data layout is stored as an AV file management table by the HDD control circuit 12 and managed at the same time.

As shown in FIG. 3 , once an AV file creation command 90 is issued from the controller 20 , in the audiovisual data recording and playback device 10 , the interface circuit 11 receives the AV file creation command 90 and sends it to the HDD control circuit 12 . The HDD control circuit 12 regenerates the AV file 40 of the size specified by the AV file size specification parameter of parameter 2 .

At this time, as shown in FIG. 4(a) and FIG. 5(a)(b), the AV file 40 is set on the hard disk 16 as a repeated recording area.

Next, the controller 20 issues a recording operation setting command 91 . Once the audiovisual data recording and playback device 10 receives the recording operation setting command 91, the HDD control circuit 12 sets the operation mode specified by the parameter 2 recording in the AV file 40, which is the rewriting mode here.

Next, the controller 20 issues an AV file overwrite recording command 93 . When the audiovisual data recording and playback device 10 receives the AV file overwrite record command 93 , the HDD control circuit 12 starts overwrite record for the AV file 40 .

The rewriting recording of above-mentioned AV file 40 is on the hard disk 16 as shown in Figure 4 (a) and Figure 5 (a), in the repeated recording area 41, that is, from the repeated recording area initial position 43 to the repeated recording area final position The interval of 45 is realized as AV data recording. Once the recording of AV data reaches the final position 45 of the repeated recording area, the recording position returns to the initial position 43 of the repeated recording area, and the recording is repeated by overwriting, and then the overwriting operation is repeated again.

Next, when normal recording is performed according to the user's desire, the above-mentioned repeated overwriting mode is terminated, and an additional recording operation is performed. In order to perform this additional recording operation, the operation of the audiovisual data recording and reproducing apparatus 10 is as follows. That is, the controller 20 issues an additional recording command 92 to the audiovisual data recording and reproducing device 10 . In the audiovisual data recording and playback device 10, once the additional recording command 92 is transmitted from the interface circuit 11, the HDD control circuit 12 starts additional recording of new data in the AV file 40 that is repeatedly overwritten and recorded (see FIG. 4(b)). .

Next, if the additional recording to the above-mentioned AV file 40 is described from the hard disk 16 side, as shown in FIG. Then the position at this time is determined as the additional recording command confirmation position 44 . Then, the recording head of the hard disk 16, which is the recording position, moves directly to the final position 45 of the repeated recording area, and restarts recording of AV data in the recording area after this position. As shown in Figure 5 (b), the recording area 42 for additional recording is the area from the starting point 45 of the repeated recording area to the recording position 50, and it does not overlap with the recording area 41. Pre-recorded recording areas are maintained.

Finally, when the recording operation ends, the controller 20 issues a stop command 96 to the audiovisual data recording and reproducing device 10 . On the audiovisual data recording and reproducing apparatus 10 side, when the HDD control circuit 12 receives the stop command 96, the recording operation is terminated.

Next, the reproducing operation of the audiovisual data recording and reproducing apparatus according to the first embodiment will be described with reference to FIG. 6. FIG.

FIG. 6 shows the sequence of various commands issued from the controller 20 to the audiovisual data recording and reproducing apparatus 10 when reproducing AV data from an AV file.

As shown in the figure, the controller 20 issues a playback operation setting command 94 to the audiovisual data recording and playback device 10 . On the side of the audiovisual data recording and playback device 10, once the HDD control circuit 12 receives the playback action setting command 94, it sets the playback action specified by the parameter 2 in the specified AV file (the current situation is the AV file 40). Action mode.

Next, the controller 20 issues a playback command 95 to the audiovisual data recording and playback device 10 . On the audiovisual data recording and reproducing device 10 side, the HDD control circuit 12 starts reproducing the AV file 40 upon receiving the replay command 95 .

Here, the reproduction of the AV file 40 is to reproduce the repeated recording area 41 and the recording area 42 on the hard disk 16 as shown in FIG. 4( a ). And because repeated overwrite recording is carried out in repeated recording area 41, so AV data is not necessarily recorded along time sequence, but as shown in Fig. 4 (b), AV file 40 is set, makes along time axis from Since the data recorded earlier starts to reproduce the AV data, the AV data can be reproduced like a normal reproduction operation.

Finally, when the playback operation ends, the controller 20 issues a stop command 96 to the audiovisual data recording and playback device 10 . On the audiovisual data recording and playback device 10 side, when the HDD control circuit 12 receives the stop command 96, the playback operation ends.

In addition, for the area where the AV file is not rewritten, that is, the area where the AV data is not recorded in the repeated recording area 41 or the recording area 42 on the hard disk 16, when the controller 20 sends a playback command 95, the audiovisual data recording and playback device 10 will perform the playback according to the playback command 95. The playback operation mode of the parameter 2 set by the playback operation setting command 94 is to play back predetermined image data (such as a blue background image) in the alternative data playback mode, and to suspend the playback operation in the stop mode.

Implementation form 2

Next, an audiovisual data recording and reproducing apparatus according to Embodiment 2 of the present invention will be described. The audiovisual data recording and reproducing apparatus 10 of the second embodiment has the same configuration as that of the first embodiment, and generates and operates an AV file different from that of the first embodiment in accordance with a control command from the controller 20 .

10(a) to (c) are diagrams showing the format of each control command received and executed by the audiovisual data recording and playback device 10 according to Embodiment 2 of the present invention. Next, each control command and the operation executed by each control command will be described with reference to this figure.

First, Fig. 10(a) is the maximum file size setting command 97/98, which sets the maximum file size in the AV file. The maximum file size setting command 97/98 has an AV file designation parameter as parameter 1 and a maximum file size designation parameter as parameter 2.

When receiving the maximum file size setting command 97/98, the HDD control circuit 12 stores the maximum file size specified by parameter 2 as specified AV file management information. When an invalid maximum file size is specified, the maximum file size is removed.

In addition, FIG. 10(b) is a recording operation setting command 91, and FIG. 10(c) is an additional recording command, both of which have the same functions as those in the first embodiment.

Also in the audiovisual data recording and reproducing apparatus 10 of the second embodiment, the playback command 95 shown in FIG. 9(f) and the stop command 96 shown in FIG. 9(g) are used.

Next, the operation of the audiovisual data recording and reproducing apparatus 10 having the above-mentioned configuration in Embodiment 2 of the present invention will be described.

First, the pre-recording operation of the audiovisual data recording and reproducing apparatus 10 will be described with reference to FIGS. 7 and 8 . FIG. 7 shows the sequence of control commands sent from the controller 20 to the audiovisual data recording and reproducing apparatus 10 during the pre-recording operation. FIG. 8 shows the relationship between the AV data arrangement on the hard disk 16 and the data arrangement of the AV file when the pre-recording operation is performed in the second embodiment.

In addition, the relationship between the data layout on the hard disk 16 shown in FIG. 8 and the AV data layout is the same as in the first embodiment, and is stored as an AV file management table by the HDD control circuit 12 and managed at the same time.

As shown in FIG. 7 , once the maximum file size setting command 97 is issued from the controller 20 , the interface circuit 11 receives the maximum file size setting command 97 in the audiovisual data recording and playback device 10 and sends it to the HDD control circuit 12 . The HDD control circuit 12 sets the maximum file size 80 specified by the parameter 2 to the specified AV file 81 .

At this time, the AV file 81 is set as the repeated recording area 41 on the hard disk 16 as shown in FIG. 8( b ). However, it is different from the repeated recording object 41 of the first embodiment. The initial position 43 of the repeated recording area is fixed, but the recording position corresponding to the final position 45 of the repeated recording area is not set, and the size of the repeated recording area 41 is specified as a variable in the setting stage. In addition, the potential repeated recording area set by the maximum file size 80 is determined by the initial position 43 of the repeated recording area and the maximum limit address 83 .

Next, the controller 20 issues a recording operation setting command 91 . Upon receiving the recording operation setting command 91 in the audiovisual data recording and reproducing device 10 , the HDD control circuit 12 sets the recording operation method specified by the parameter 2 , here, the overwriting method, in the AV file 81 .

The controller 20 then issues an additional recording command 92 . When the audiovisual data recording and playback device 10 receives the additional recording command 92 , the HDD control circuit 12 starts additional recording of the AV file 81 specified by the parameter 1 .

The additional recording operation of the AV file 81 is realized as AV data recording from the start of the repeated recording area 41 on the hard disk 16 as shown in FIG. 8( b ).

With the recording operation of the above-mentioned additional recording command 92, the amount of data recording also increases, and the size of the AV file 81 also increases accordingly, and the repeated recording area 41 on the hard disk 16 also increases. Once the size of the AV file 81 reaches the maximum file size 80 set by the maximum file size setting command 97, the HDD control circuit 12 will start from the data with the earliest recording time in the AV file according to the set recording operation mode, that is, the rewriting mode. Overwrite recording is performed together to form a repeated overwrite recording method.

The repeated overwrite recording of this AV file 81 is to record as AV data from the repeated recording area 41, that is, from the repeated recording area starting position 43 to the maximum limit address 83, as shown in Figure 8 (b) on the hard disk 16. Achieved. Once the recording of AV data reaches the maximum limit address 83, the recording position returns to the start position 43 of the repeated recording area, and recording is performed in the repeated recording area 41 by repeated overwriting.

Next, when normal recording is performed according to the user's desire, the above-mentioned iterative overwriting method is terminated, and normal recording operation is performed. To perform this normal recording operation, the audiovisual data reproducing device 10 operates as follows. That is, the controller 20 issues a maximum file size setting command 98 to the audiovisual data recording and playback device 10 .

In this maximum file size setting command 98, the maximum file size designation parameter of parameter 2 is different from the maximum file size setting command 97 received above, and has the content that the maximum file size 80 is invalid. Therefore, according to the new maximum file size setting command, that is, the maximum file size setting command 98, the management table of the AV file 81 is reset, and the maximum file size 80 is deleted at the same time, so that the size of the recording area is not limited.

In addition, on the management table 81, the corresponding position at the time when the above-mentioned maximum file size setting command 98 is confirmed is determined as the maximum file size setting command confirmation position 82, and the maximum file size setting command confirmation position 82 is used as a starting point, A normal recording operation is started (see FIG. 8( a )).

Next, if the normal recording to the above-mentioned management table 81 is described from the hard disk 16 side, as shown in FIG. Command 98, then the position at this moment is determined as the maximum file size setting command confirmation position 82, the recording head of hard disk 16 directly moves to the maximum limit address 83, and records the AV data in the recording area after this position.

As shown in Figure 8 (b), the recording area 42 that is usually recorded is the area from the maximum limit address 83 to the recording position 50, and the repeated recording area 41 is from the repeated recording area start position 43 to the maximum limit address. 83 to the area. Therefore, the repeated recording area 41 and the recording area 42 are divided by the maximum limit address 83, and the repeated recording area 41 is held as a pre-recorded recording area.

Finally, when the normal recording operation ends, the controller 20 issues a stop command 96 to the audiovisual data recording and reproducing apparatus 10 . On the audiovisual data recording and reproducing apparatus 10 side, when the HDD control circuit 12 receives the stop command 96, the recording operation is terminated.

As described above, according to the audiovisual data recording and reproducing apparatuses of Embodiment 1 and Embodiment 2, a predetermined area which can be arbitrarily set by the user is set in the recording area, recording operation can be controlled, and repeated overwrite recording such as pre-recording can be performed.

In addition, in Embodiments 1 and 2, the description has been given for the case where there is a pre-record operation in which overwrite recording is repeatedly performed and a normal recording in which recording is performed only once, but the entire recording area may be used for the pre-record operation. In this case, loop recording can be performed, for example, it can be used for anti-theft cameras and the like.

Implementation form 3

The configuration of the audiovisual data recording and reproducing apparatus of this embodiment is the same as that of the audiovisual data recording and reproducing apparatus of Embodiments 1 and 2 shown in FIG. 1 .

However, the management of the AV data position information within the AV file is configured in consideration of relative position information based on the start of the AV file.

Next, referring to FIG. 22, the situation of managing the position of the AV data in the AV file using the relative position information in the repeated recording mode will be described.

Figure 22 shows the change of position information when each frame position in an AV file being recorded in a repeated recording mode is managed with relative position information. relative position information. As shown in Figure 22 (b) to (d), once the frame data is newly input during the repeated recording, the first frame of the AV file is deleted, and the input frame data is added to the next frame position of the last frame of the AV file at the same time. The new final frame.

As described above, when the relative position information is used for management in the repetitive recording method, the position information for a predetermined frame will change as the recording continues. That is, if you pay attention to the content of the frame such as C, its position information changes sequentially as 2→1→0.

In addition, since the recording position is always the last frame of the AV file, it is a constant value and does not change. The playback position at the standard speed is also constant and does not change. Therefore, it cannot be determined from the recording/reproducing position information whether recording/reproducing is being performed or is being stopped.

Therefore, in the video and audio data recording and playback device of this embodiment, regarding the file management method and the AV data position information management method in the AV file, in the repeated recording method, the predetermined image data position information does not change as the position information management method. Absolute position information.

Fig. 11 shows the AV data recording area on the hard disk 16 in this embodiment, the relationship with the AV file, and the AV file area management table for managing the AV data position information in the AV file.

In Fig. 11, the AV file area management table 111 holds the management information of each area of each AV file. As the area management information, the area start address 112, area size 113, AV file start address 114 and The starting position information 115 is constituted. The AV file start position information 115 holds the offset value of the AV file start position information.

FIG. 12 shows the relationship between the data areas and AV files on the hard disk 16 managed by the AV file area management table. FIG. 12( a ) shows the data arrangement in the data area 121 on the hard disk 16 , and FIG. 12( b ) shows the data arrangement in the AV file 120 .

The relationship between the data area 120 and the AV file 121 in FIG. 12 is managed by using the area start position 123 , the area end position 125 and the AV file start position 124 . Address information on the hard disk 16 corresponding to each location is stored and managed by the HDD control circuit 12 as the AV file management table 111 .

In addition, FIGS. 13(a) to (e) are diagrams showing the format of each control command received and executed by the audiovisual data recording and playback device 10 of this embodiment. In FIG. 13 , the operation code is a type code indicating the type of command, and parameter 1 and parameter 2 are control parameters specified when the control command is executed.

Hereinafter, each control command and the operation executed according to each control command will be described with reference to the drawings.

First, a search command 131 is shown in FIG. 13(a). The search command 131 has a virtual plug specifying parameter as parameter 1 and target position information as parameter 2 .

When receiving the search command 131, the HDD control circuit 12 sets the recording and playback position at the target position specified for the specified virtual plug. The AV file set as the search target and the recording/playback position within the AV file are specified in the target position information.

The so-called virtual plug here is the input and output plug that is virtually set inside the machine. The audiovisual data recording and reproducing apparatus 10 of the present embodiment has one input plug and one output plug, and recording and reproducing can be designated to the hard disk at the same time by using these two dummy plugs. The output or input of AV data from the dummy plug is actually output or input from the audiovisual data recording and reproducing apparatus 10 using the interface circuit 11 in time-sharing.

Next, FIG. 13( b ) shows the position information inquiry command 132 . The position information inquiry command 132 has a virtual plug specifying parameter as parameter 1 . When receiving the position inquiry command 132, the HDD control circuit 12 outputs the recording and playback position information corresponding to the designated virtual plug as a command response signal. The recording and playback position information indicates the AV file set as the recording and playback target and the recording and playback position information in the AV file.

Next, a record command 133 is shown in FIG. 13(c). The recording command 133 has a dummy plug specifying parameter as parameter 1 and a recording method specifying parameter as parameter 2 .

When receiving the recording command 133, the HDD control circuit 12 records the AV data input to the designated virtual plug in the AV file from the recording and playback position set in the AV file corresponding to the virtual plug in the designated recording method.

When the normal recording mode is specified, data is sequentially recorded in the AV file, and the size of the AV file 120 is sequentially increased as the recording progresses.

At this time, the HDD control circuit 12 stores 0 frames in the AV file start position information 115 of the AV file area management table 111 as an offset value. Each subsequent frame position is managed as a relative position relative to the beginning of the AV file as the 0 frame.

When designated as the repeated recording mode, the data is overwritten and recorded in the AV file in turn, and the data is overwritten and recorded in the AV file in turn, and when all the AV files are rewritten, the initial data of the AV file is deleted in turn, and New data is recorded in the final part of the AV file. At this time, the HDD control circuit 12 stores the frame number of the start frame of the AV file as an offset value in the AV file start position information 115 of the AV file area management table 111 . Each subsequent frame position is managed as an absolute position using the frame number 0 with the repeated recording start time as the frame number.

Next, a playback command 134 is shown in FIG. 13(d). The playback command 134 has a virtual plug specifying parameter as parameter 1 . Upon receiving the playback command 134, the HDD control circuit 12 starts playback from the set recording and playback position of the AV file corresponding to the designated virtual plug, and outputs from the designated virtual plug.

Finally, a stop command 135 is shown in FIG. 13(e). The stop command 135 has a virtual plug specifying parameter as parameter 1 . Once the HDD control circuit 12 receives the stop command 135, it ends the recording operation or playback operation corresponding to the specified virtual plug.

Referring to Fig. 14, a description will be given of a case where the same AV file is repeatedly recorded and reproduced simultaneously in the audiovisual data recording and reproducing apparatus 10 according to Embodiment 1 of the present invention having the above-mentioned structure.

FIG. 14 shows the sequence of control commands sent from the controller 20 to the audiovisual data recording and reproducing apparatus 10 when the recording operation and the reproducing operation are repeated simultaneously.

First, the controller 20 issues a search command 131 specifying a virtual input plug and a recording start position. When the audiovisual data recording and playback device 10 receives the search command 131, the HDD control circuit 12 sets the recording start position set by the designated AV file 120 as the recording position of the designated virtual input plug.

Next, the controller 20 issues a record command 133 specifying a dummy input plug and a repeat recording mode. Once the audiovisual data recording and playback device 10 receives the record command 133, the HDD control circuit 12 starts to reproduce the AV data input from the designated virtual input plug from the recording start position of the AV file 120 set for the designated virtual output plug. write record.

The overwrite recording of the above-mentioned AV file 120 is realized as repeated overwrite recording in the section from the area start position 123 to the area end position 125 in the data area 121 as shown in FIG. 12(a).

Next, the controller 20 issues a search command 132 specifying a virtual output plug and a playback start position. When the audiovisual data recording and playback device 10 receives the search command 132, the HDD control circuit 12 sets the playback position set by the specified AV file 120 as the playback position of the specified virtual output plug.

Next, the controller 20 issues a playback command 134 specifying the virtual output plug to the audiovisual data recording and playback device 10 . On the audiovisual data recording and reproducing apparatus 10 side, when the HDD control circuit 12 receives the playback command 134, it starts playback from the playback start position of the AV file 120 set for the designated virtual output plug.

Here, the playback of the AV file 120 is as shown in Figure 12 (a), the data area 121 is played back on the hard disk 16, and in the data area 121, due to repeated overwriting and recording, the AV data does not necessarily follow the time sequence. Record. However, the HDD control circuit 12 reproduces the AV file as an AV file in which AV data is arranged along the time axis, as shown in FIG. replay.

When it is desired to obtain recording position information or reproduction position information during repeated recording or reproduction, the controller 20 issues a position information inquiry command 132 specifying a virtual plug. Upon receiving the location information inquiry command 132 in the audiovisual data recording and playback device 10, the HDD control circuit 12 outputs the recording and playback location information of the specified virtual plug.

Finally, when the repeated recording operation and playback operation are ended, the controller 20 issues a stop command 135 to the audiovisual data recording and playback device 10 to designate the virtual output plug and the virtual input plug. On the audiovisual data recording and reproducing device 10 side, the HDD control circuit 12 ends the reproducing operation and the recording operation upon receiving each stop command 135 .

Designation and display of the recording position and the reproduction position when the same AV file is repeatedly recorded and reproduced at the same time will be described below with reference to the example shown in FIG. 15 .

Fig. 15 shows changes in position information in an AV file for repeated recording. FIG. 15(a) shows input AV data, and FIGS. 15(b) to 15(d) show changes in recorded content of the AV file and temporal changes in position information. In FIG. 15, the AV file size is 7 frames.

Fig. 15(b) shows the recorded content of the AV file when 6 frames have elapsed after the start of recording. The position information corresponding to frame a to frame g recorded in the AV file is frame 0 to frame 6. The recording position is 6 frames. Also, the playback position at which the playback operation starts after a delay of 3 frames from the start of recording is 3 frames. 0 in the position information is, for example, a counter value when recording in the iterative mode is started.

Fig. 15(c) shows the recorded content of the AV file when 7 frames have elapsed since the start of recording. The position information corresponding to frame b to frame h recorded in the AV file is frame 1 to frame 7. The recording position is 7 frames, and the playback position is 4 frames.

Fig. 15(d) shows the recorded content of the AV file when 8 frames have elapsed since the start of recording. The position information corresponding to frame c to frame i recorded in the AV file is frame 2 to frame 8. The recording position is 8 frames, and the playback position is 5 frames.

As mentioned above, according to this embodiment, since the position information corresponding to the predetermined frame does not change during repeated recording (for frame content c, the position information is all 2), so the recording position of the AV file in repeated recording and the corresponding The playback position when the AV file being repeatedly recorded is played back at the standard speed is the same as when the normal AV file is recorded and played back, and is sequentially increased. Therefore, even if the AV file is being recorded by the repeat recording method, the recording and playback operation state can be judged based on the change of the recording and playback position information in the same way as when recording and playing a normal AV file.

In addition, since the AV file can be accessed by specifying an absolute position, the AV data in the AV file can be correctly accessed on a frame-by-frame basis.

In addition, since the controller 20 uses the position information obtained by the position information inquiry command, it is possible to manage the playback position and the recording position in the same way as in normal recording and playback.

Embodiment 4

The configuration of the audiovisual data recording and reproducing apparatus of this embodiment is the same as that of the audiovisual data recording and reproducing apparatus of Embodiments 1 to 3 shown in FIG. 1 .

In addition, the configuration of the AV file area management table and the corresponding command set in this embodiment are the same as those in the third embodiment, and the corresponding explanatory diagrams are also the same.

The difference between the operation of the audiovisual data recording and reproducing apparatus of the present embodiment and the third embodiment is the location information management method.

Next, the location information management method of this embodiment will be described with reference to FIG. 16 .

Fig. 16 shows the change of the position information in the AV file which is being repeatedly recorded and the position information after the recording and playback operation of the AV file is completed.

Once the audiovisual data recording and reproducing device 10 of the present embodiment receives the recording command 133 specifying the virtual input plug and the repeat recording mode, the HDD control circuit 12 starts recording from the recording start position of the AV file 120 set by the designated virtual output plug. AV data input from the specified virtual input plug is overwritten and recorded.

Once the recording operation according to the repeat recording method starts, the HDD control circuit 12 records the frame number of the AV file start frame as an offset value in the AV file start position information 115 of the AV file area management table 111, and continuously updates it sequentially.

In this manner, the HDD control circuit 12 can manage the frame numbers using the frame numbers in which the repeated recording start time is the frame number 0 as the absolute position information of each frame.

Changes in position information in an AV file that is being repeatedly recorded are shown in Figs. 16(b) to (c) in the same way as in Embodiment 3.

When the repeated recording operation and playback operation are terminated, the controller 20 issues a stop command 135 to the audiovisual data recording and reproducing device 10 specifying the dummy output plug and the dummy input plug. On the audiovisual data recording and playback device 10 side, the HDD control circuit 12 ends the playback operation and the recording operation upon receiving each stop command 135 .

When the repeated recording operation and playback operation of the AV file are completed, the HDD control circuit 12 switches the location information management method. That is, the HDD control circuit 12 rewrites the AV file start position information 115 of the AV file area management table 111 to 0 frame as an offset value. From now on, the position information of each frame is managed by using the relative frame number from the start of the AV file as the relative start of 0 frame.

FIG. 16(c) shows the correspondence between each frame of the AV file and the position information after the repeated recording operation and playback operation of the AV file. As shown in the figure, frame b to frame h in the AV file correspond to frame 0 to frame 6 of position information.

As described above, according to this embodiment, since the position of each frame is managed as absolute position information by using the frame number with the continuous number of frame number 0 as the repeated recording start time during the repeated recording operation, once the repeated recording of the AV file After the operation and playback operation are completed, the position information of each frame is managed with the relative frame number relative to the start frame of the AV file. Similarly, each frame position can be managed using the relative position within the AV file.

Embodiment 5

The configuration of the audiovisual data recording and reproducing apparatus of this embodiment is the same as that of the audiovisual data recording and reproducing apparatus of Embodiments 1 to 4 shown in FIG. 1 .

The difference between the operation of the audiovisual data recording and reproducing apparatus of this embodiment and the operation of the audiovisual data recording and reproducing apparatus of Embodiments 3 and 4 is the location information management method.

Next, the location information management method of this embodiment will be described with reference to Fig. 17 and Fig. 18 .

Fig. 17 shows the corresponding change of each frame and position information in the AV file when repeated recording is interrupted. Fig. 17(a) is a timing diagram showing the input AV data and recording start and recording stop, and Fig. 17(b) and (c) are the corresponding relationship between each frame and position information in the AV file.

Fig. 18 shows the structure of the AV file area management table in this embodiment. The difference between the AV file area management table 181 of this embodiment and the AV file area management tables of other embodiments is that it has the start position address, size and start position information of each segment in the AV file. Since the number of segments changes dynamically, the size of the AV file area management table 181 in this embodiment also changes dynamically.

When the audiovisual data recording and reproducing apparatus 10 of this embodiment receives the record command 133 specifying the repeat recording mode, the HDD control circuit 12 starts to overwrite record the AV file output from the specified virtual input plug. At this time, the HDD control circuit 12 stores 0 frames at the segment #0 start position information 182 of the AV file area management table 181 as an offset value. Therefore, frames 0, 1, and 2 are added as position information to the input frames a, b, and c corresponding to consecutive numbers. A segment corresponds to 1 unit from recording start to recording stop.

After the audiovisual data recording and reproducing apparatus 10 has recorded frames a to d, upon receiving a stop command 135 for stopping the recording operation, the HDD control circuit 12 stops the recording operation.

Furthermore, once the audiovisual data recording and playback device 10 receives the recording command 133 specifying the repeat recording mode again, the HDD control circuit 12 restarts the repetition of frames g, h, and i sequentially from the next frame of the previous recording stop position frame d. write record.

At this time, the HDD control circuit 12 generates a new segment #1 having the resumed recording frame as configuration data, and stores the management information of the segment #1 in the AV file area management table 101 . In the segment #1 start position information 183, the frame number 4 next to the last frame (3 frames) of the segment #0 is recorded as the frame number of the segment #1 start frame. Thereafter, frames 4, 5, and 6 are added as position information to the input frames g, h, and i correspondingly with consecutive numbers.

If three frames are overwritten and recorded after the repeated recording operation is restarted, as shown in FIG. 17(b), the entire AV file is overwritten. After that, as shown in FIG. 17(c), the same repeated recording operation as in other embodiments is continued in which the first frame is deleted and a new frame is added to the last part.

At this time, the HDD control circuit 12 sequentially rewrites and stores the segment #0 start frame number in the segment #0 start position information 182 of the AV file area management table 181 . Section #1 start position information 183 does not change with time.

In this embodiment, the AV file has a segment structure, and the structure changes as the repeated recording operation continues. If the repeated recording operation continues, as shown in Figs. 17(b) and (c), the size of segment #0 decreases and the size of segment #1 increases. When the repeated recording is continued for a predetermined time, the original segment #0 disappears, and the original segment #1 is replaced by a new segment #0.

As described above, in the audiovisual data recording and reproducing apparatus of this embodiment, once the repeated recording operation is interrupted, a new segment is created. In addition, each frame of the AV file corresponds to the position information added and the position information before the interruption of the repeated recording operation, and is managed with consecutive numbers.

In this way, AV data recorded from the start of recording to the end of recording can be managed as individual segments. In addition, as the entire AV file, the position of each frame can be managed based on absolute positions consecutively assigned with serial numbers. Section NO. Also as absolute position.

In addition, in this embodiment, the case where the repeated recording operation is interrupted only once has been described, but it is obvious that it can also be applied to the case where the repeated recording operation is interrupted a plurality of times. Every time this recording operation is interrupted, a new segment is generated.

In addition, in this embodiment, a frame is used as an access unit in an AV file, but the access unit is not limited to a frame, and other access units may be used.

Using the means described in Embodiments 3 to 5 above, when the audiovisual data recording and reproducing apparatus of the present invention performs recording in the repeat recording mode, the reproduction position information and the recording position information are sequentially increased as in the normal recording and reproduction. In addition, since the AV file can be accessed by specifying an absolute position, the AV data in the AV file can be accurately accessed on a frame-by-frame basis.

In addition, in the controller, the playback position and the recording position can be managed similarly to normal recording and playback by using the position information acquired by the position information inquiry command.

In addition, once the repeated recording operation and playback operation of the AV file are completed, since the position information of each frame is managed with the relative frame number relative to the start frame of the AV file, even if it is an AV file that is repeatedly recorded, it is possible to Manage with relative positions within the AV file.

In addition, AV data recorded from the start of recording to the end of recording can be managed as independent segments. On the other hand, as the entire AV file, each frame position can be managed based on the absolute position to which a serial number is added.

In addition, in each of the above-mentioned embodiments, the audiovisual data recording device and the audiovisual data recording and reproducing device are described as an integrated audiovisual data recording and reproducing device, but both may be independent.

In addition, in each embodiment, data including video and audio is processed as AV data, but of course only video or audio data may be processed.

In addition, in each embodiment, the operations of the interface circuit 11 and the HDD control circuit 12 are realized by hardware, but this can also be realized by software through the action of a program using a computer.

In addition, in each embodiment, the operations of the interface circuit 11 and the HDD control circuit 12 may be realized as a program using a computer and recorded on a program recording medium.

Industrial Utilization Possibility

As described above, according to the audiovisual data recording and reproducing apparatus of the present invention, a predetermined area that can be set arbitrarily by the user is provided in the recording area, and recording operation can be controlled, so that repeated overwrite recording such as pre-recording can be performed.

In addition, when the audiovisual data recording and reproducing apparatus of the present invention performs recording in the repeat recording method, the reproduction position information and the recording position information are sequentially increased as in normal recording and reproduction. In addition, since the AV file can be accessed by specifying an absolute position, the AV data in the AV file can be accurately accessed on a frame-by-frame basis.

Claims (27)

1. a video/audio data pen recorder is characterized in that having

The recording medium of document image and/or voice data,

To the recording areas in the aforementioned recording medium carry out image and/or voice data record the recording areas recording means,

The order that receives control command from the machine that connects by bus receive means,

And AV file management means,

Described AV file management means are when utilizing described order reception means to receive the order that generates the AV file, and setting comprises the recording areas of described recording medium and the AV file management table of the corresponding informance between the AV file, generate the AV file of prescribed level,

Earlier figures as the voice data record device in, aforementioned recording areas recording means carries out the record of image and/or voice data according to aforementioned AV file management table to described recording areas.

2. video/audio data pen recorder as claimed in claim 1 is characterized in that,

Described recording areas recording means passes through to rewrite repeatedly to the recording areas of described AV file correspondence according to described AV file management table, carries out the record of image and/or voice data.

3. video/audio data pen recorder as claimed in claim 2 is characterized in that,

Described order reception means receive the additional record order of described AV file being carried out the additional record action,

In a single day described recording areas recording means receives described additional record order, then carries out the record of image and/or voice data in the recording areas different with described regenerative recording repeatedly district.

4. a video/audio data pen recorder is characterized in that having,

The recording medium of document image and/or voice data,

To the recording areas in the described recording medium carry out image and/or voice data record the recording areas recording means,

The order that receives control command from the machine that connects by bus receive means,

And AV file maximum file size setting means,

When utilizing described order reception means to receive the maximum file size setting command of regulation AV file maximum file size, described AV file maximum file size is set means and set described maximum file size in the AV file management table.

In described video/audio data pen recorder, described recording areas recording means carries out the record of image and/or voice data according to described AV file management table to described recording areas.

5. video/audio data pen recorder as claimed in claim 4 is characterized in that,

Described recording areas recording means passes through to rewrite repeatedly to the recording areas of described AV file correspondence according to the AV file maximum file size in the described AV file management table, carries out the record of image and/or voice data.

6. video/audio data pen recorder as claimed in claim 5 is characterized in that,

Described AV file maximum file size is set means in operation of recording, when utilizing described order reception means newly to receive the maximum file size setting command, resets maximum file size in the AV file management table,

Described recording areas recording means carries out the record of image and/or voice data according to the described AV file management table change action that resets to described recording areas.

7. a video/audio data replay device is characterized in that having

The recording medium of document image and/or voice data,

The AV file management means that the AV file management table of corresponding informance between the recording areas that comprises described recording medium and the AV file is managed,

The order that receives control command from the machine that connects by bus receive means,

And receive the playback means that the image that each described video/audio data pen recorder in the claim 1 to 6 write down after the described control command and/or voice data are reset,

In described video/audio data replay device,

It is the reproduction command of the playback action of object that described order reception means receive the data of carrying out with the AV file,

In a single day described playback means receive described reproduction command, just carry out the playback of image and/or voice data from described recording areas according to described AV file management table.

8. video/audio data replay device as claimed in claim 7 is characterized in that,

When described playback means have the zone of document image not and/or voice data to be the no record district in described recording areas, will be with the data division of this recording areas the surrogate data method of suitable quantity reset.

9. described video/audio data replay device as claimed in claim 7 is characterized in that,

When described playback means have the zone of document image not and/or voice data to be the no record district in described recording areas, stop to carry out the playback of image and/or voice data from described recording areas.

10. as the described video/audio data replay device of arbitrary claim in the claim 7 to 9, it is characterized in that,

Described playback means with the data of described recording areas record according to the record order successively from record at first begin reset.

11. a video/audio data recording/displaying device is characterized in that, is each described video/audio data replay device in each described video/audio data pen recorder and the claim 7 to 10 in the claim 1 to 6 is combined.

12. a video/audio data recording method is characterized in that, has adopted

The recording medium of document image and/or voice data,

To the recording areas in the described recording medium carry out image and/or voice data record the recording areas recording means,

The order that receives control command from the machine that connects by bus receive means,

And AV file management means,

Described AV file management means are when utilizing described order reception means to receive the order that generates the AV file, and setting comprises the recording areas of described recording medium and the AV file management table of the corresponding informance between the AV file, generate the AV file of prescribed level,

In described video/audio data recording method, comprise and adopt described recording areas recording means described recording areas to be carried out the step of image and/or voice data record according to described AV file management table.

13. a video/audio data playback method is characterized in that, has adopted

The recording medium of document image and/or voice data,

The AV file management means that the AV file management table of the recording areas that comprises described recording medium and the corresponding informance between the AV file is managed,

The order that receives control command from the machine that connects by bus receive means,

And will utilize the image of the described video/audio data recording method record of claim 2 and/or the playback means that voice data is reset after receiving described control command,

In described video/audio data playback method,

Comprise and receive with described order reception means that to carry out with the AV file data be the step of reproduction command of the playback action of object,

Also comprise with described playback means and in a single day receive described reproduction command is promptly carried out image and/or voice data playback from described recording areas according to described AV file management table step.

14. a program record medium is characterized in that, has write down the program of being used by all or part of function of each described each means of video/audio data pen recorder or each several part in the requirement 1 to 6 of computing machine enforcement of rights.

15. a program record medium is characterized in that, has write down the program of being used by all or part of function of each described each means of video/audio data replay device or each several part in the requirement 7 to 9 of computing machine enforcement of rights.

16. a program record medium is characterized in that, has write down by the computing machine enforcement of rights and has required the action of 12 described video/audio data recording methods or the program that part steps is used.

17. a program record medium is characterized in that, has write down the program that requires all or part of step of the action of 13 described video/audio data playback methods to use by the computing machine enforcement of rights.

18. a video/audio data recording/displaying device is characterized in that having

With the recording means that writes down as the AV file of AV data block of input,

The playback means that the AV data block of AV file logging is reset,

The AV file designating means of appointment AV file,

The recording playback position designating means of the recording playback position in the appointment AV file,

And location information management means and recording playback set positions means,

When described location information management means are recorded in the AV file in the AV data block that will import successively, additional do not carry out and change the absolute location information of positional information each AV data block is corresponding, and it is stored and manage as positional information with record,

Described recording playback set positions means, be when utilizing described recording playback position designating means to specify the recording playback position, in the AV file that utilizes the appointment of described AV file designating means, look for the AV data block consistent with described assigned address according to the described positional information of described location information management means management, and in this data block setting recording playback position

Described recording means or playback means as starting points, write down the recording playback position of being set by described recording playback set positions means in the AV file of appointment or reset.

19. video/audio data recording/displaying device as claimed in claim 18 is characterized in that, described recording means and playback means are carried out repeatedly operation of recording and the action of resetting simultaneously to same AV file.

20. as claim 18 or 19 described video/audio data recording/displaying devices, it is characterized in that,

Have the control command that receives control command and receive means,

Also has the positional information output means, when utilizing described control command reception means to receive the control command that requires positional information, described positional information output means is exported by the corresponding additional positional information of described location information management means as present record position or replay position.

21., it is characterized in that having as each described video/audio data recording/displaying device in the claim 18～21

The control command that receives control command receives means,

Aforementioned AV file designating means and described recording playback position designating means are specified AV file and recording playback position according to the parameter of the control command of utilizing described control command reception means to receive.

22. a video/audio data recording/displaying device is characterized in that having

With the recording means that writes down as the AV file of AV data block of input,

The playback means that the AV data block of AV file logging is reset,

The AV file designating means of appointment AV file,

The recording playback position designating means of the recording playback position in the appointment AV file,

And location information management means and recording playback set positions means,

Described location information management means have the 1st and the 2nd positional information managing method; And can switch described two kinds of methods according to the recording playback manner of execution; Described the 1st positional information managing method is when the AV data block that will import successively is recorded in the AV file; Additional do not carry out with record and change the absolute location information of content each AV data block is corresponding; And it is stored and manage as positional information; Described the 2nd positional information managing method is that described AV files specify position is managed as the relative position information of the starting point positional information as each AV data block

Described recording playback set positions means, be when utilizing described recording playback position designating means to specify the recording playback position, in the AV file that utilizes the appointment of described AV file designating means, look for the AV data block consistent according to the corresponding additional positional information of described location information management means with described assigned address, and in this data block setting recording playback position

Described recording means or playback means as starting points, write down the recording playback position of being set by described recording playback set positions means in the AV file of appointment or reset.

23. video/audio data recording/displaying device as claimed in claim 22 is characterized in that, described recording means and playback means are carried out repeatedly operation of recording and the action of resetting simultaneously to same AV file.

24. video/audio data recording/displaying device as claimed in claim 23, it is characterized in that, described location information management means are being carved into when the AV file is begun repeatedly operation of recording during till whole operation of recording of described AV file and the playback release, carry out location information management with described the 1st positional information managing method, beyond during above-mentioned, carry out location information management with described the 2nd positional information managing method.

25. video/audio data recording/displaying device as claimed in claim 24, it is characterized in that, have the segment management means that the section structure in the described AV file is managed, described recording means is had no progeny when restarting in operation of recording repeatedly, and the AV data block that will restart the back input is recorded in new section.

26. as each described video/audio data recording/displaying device in the claim 22～25, it is characterized in that,

Have the control command that receives control command and receive means,

Also has the positional information output means, when utilizing described control command reception means to receive the control command that requires positional information, described positional information output means is exported by the corresponding additional positional information of described location information management means as present record position or replay position.

27., it is characterized in that having as each described video/audio data recording playback position in the claim 22～26

The control command that receives control command receives means,

Described AV file designating means and described recording playback position designating means are specified AV file and recording playback position according to the parameter of the control command of utilizing described control command reception means to receive.

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